An integrated monitoring system for railway line status

Abstract

The present invention relates to the technical field of railway condition monitoring, in particular to a comprehensive railway line condition monitoring system, which includes a condition monitoring unit for the railway line. The condition monitoring unit transmits data progressively through a wireless transmission network to a canopy unit, which is the end point for receiving wireless receipts. The canopy unit transmits the obtained transmission data to a detection data center through a local area network. The condition detection unit is powered by a power supply. The present invention has the advantages of a wide detection range, strong applicability, a reliable identification method, online monitoring, a simple unit structure, and can be set according to the actual equipment sequence.

Description

Technical Field

[0001] The present invention relates to the technical field of railway condition monitoring, and particularly to a comprehensive railway line condition monitoring system. Background Art

[0002] In recent years, the railway in China has developed rapidly, with a large construction scale and high operation efficiency. The demand for railway passenger transport has gradually increased, the train operation speed has been continuously improved, and the train operation density has been further increased, bringing new problems to line maintenance. At the same time, natural disasters, emergencies and other situations also pose threats to railway transportation safety. Railway transportation safety issues have become increasingly prominent and have attracted more and more attention from all sectors of society. Especially for passenger dedicated lines, with high speed, large density and carrying passengers, if a transportation safety accident occurs after a problem, it will cause huge casualties and property losses. Therefore, monitoring the line condition is the basis for scientific line maintenance and one of the effective means to prevent major safety accidents. Establishing a comprehensive railway line monitoring system to timely monitor the factors threatening railway line safety and promoting scientific operation and maintenance of railway lines has become the common wish of the majority of line operation and maintenance personnel.

[0003] The continuous improvement of the world's industrial level and the great progress of science and technology have laid a good foundation for the independent production and research and development of disaster prevention and safety monitoring systems in China. The disaster prevention and safety monitoring system widely applies sensor technology, communication technology, data processing technology, computer technology, software technology, etc., and involves disciplines such as meteorology, earthquake, security, architecture, machinery, etc.

[0004] Sensors are the basic devices for the line to obtain system information and have been widely used in the disaster prevention system, responsible for collecting various environmental information along railway lines, in station buildings, vehicles, etc. At present, there are various types of sensors with complete functions on the market, including force-sensitive sensors, thermal sensors, speed sensors, liquid level sensors, Hall sensors, vibration sensors, humidity sensors, electromagnetic sensors, etc. These devices provide rich choices for system construction. The communication technology realizes the remote transmission of data and the remote and real-time monitoring. The computer network and field bus technology are continuously mature and expanding. The types and functions of network node devices such as industrial routers and switches are continuously improved and enhanced, and the data transmission capacity meets the requirements of the system.

[0005] China's invention patent CN201711227352.0 discloses a comprehensive monitoring and intelligent analysis method for the safety status of a track system. This method integrates three sensing monitoring technologies. It uses fiber Bragg grating technology to monitor low-frequency data such as structural temperature, and uses modified stress-strain technology to monitor high-frequency data such as rail transverse and vertical stress. For sensitive structures that are difficult to measure, such as turnout point rails, video sensing technology is used to observe large structural deformations and surface conditions, forming an all-weather system monitoring of the railway track system from appearance to interior, from high frequency to low frequency. By fusing and analyzing the collected multi-source data, the track status can be effectively evaluated, diagnosed and predicted, thereby achieving timely warning of the track safety status. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a railway line status monitoring system which is modular and has a fast detection speed.

[0007] To solve the above-mentioned problem, the present invention provides the following technical solutions: a comprehensive railway line status monitoring system, comprising a railway line status monitoring unit, wherein the status monitoring unit transmits data progressively to a canopy unit via a wireless transmission network, and the canopy unit is the end point for receiving wireless receipts; the canopy unit transmits the obtained transmission data to a detection data center via a local area network, and the status detection unit is powered by a power supply.

[0008] Preferably, the status monitoring unit includes a line section monitoring module and an in-station monitoring module, the section monitoring module includes a light band unit, a curve radius unit, a line slope unit, a culvert unit, a tunnel unit, a bridge unit, and a sound barrier unit; the in-station monitoring module includes a switch unit and a canopy unit.

[0009] Preferably, each monitoring unit includes three modules: data acquisition, data processing and data transmission, wherein data acquisition is a specific module, and sensors are set to acquire data according to the unit data acquisition characteristics.

[0010] Preferably, the power supply of the status monitoring unit adopts one of a current induction power supply, a wind power system, and a solar power system.

[0011] Preferably, RS485 digital or 4-20mA analog transmission is used between the sensor of each monitoring unit and the collector to unify the sensor interface; the collector automatically wakes up the MCU and turns on the sensor power when measurement is required; after the measurement is completed, it enters the sleep state and turns off the peripheral power.

[0012] After adopting the above structure and method, the present invention obtains the key data monitoring information of the possible risks existing in the corresponding operation of the line, and uploads the monitored information to the wireless transmission terminal awning unit through the method of wireless data transmission. The awning unit uploads the monitoring data to the data center by wire, and the data center obtains intuitive status information through the terminal display. In addition, different sampling frequencies are set according to the needs of the railway operation cycle to achieve energy conservation without reducing the response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0014] Figure 1 Flow chart of the intelligent comprehensive monitoring method for railway line status.

[0015] Figure 2 Schematic diagram of the composition of the intelligent comprehensive monitoring system for railway line status.

[0016] Figure 3 Wireless transmission scheme diagram of the intelligent comprehensive monitoring system for railway line status. SPECIFIC EMBODIMENTS

[0017] As Figure 1 - Figure 2 shown, the present invention includes an intelligent comprehensive monitoring system for railway line status, including a status monitoring unit for the railway line. The status monitoring unit is transmitted step by step to the awning unit through a wireless transmission network, and the awning unit is the end point of wireless receipt. The awning unit transmits the obtained transmission data to the detection data center through a local area network, and the status detection unit is powered by a power supply. Among them, the status monitoring unit includes a line section monitoring module and a station monitoring module. The section monitoring module includes a light band unit, a curve radius unit, a line gradient unit, a culvert unit, a tunnel unit, a bridge unit, and a sound barrier unit. The station monitoring module includes a turnout unit and an awning unit.

[0018] Each monitoring unit includes three modules: data acquisition, data processing, and data transmission. Among them, data acquisition is a specific module, and sensors are set according to the data acquisition characteristics of the unit to obtain data. The data processing and wireless data transmission in each monitoring unit are general modules, and all detection units are configured with this module for data analysis and upload. Among them:

[0019] The data acquisition module in the light band unit mainly includes a rail displacement monitor and an image sensor, which are used to obtain abnormal phenomena such as the overall width of the light band, eccentricity of the light band, and local abnormality of the light band.

[0020] The data acquisition module in the curve radius unit includes attitude sensors. By installing attitude sensors at both ends of the measured rail and comparing the attitude angles at rest, when the straightness changes, the angles of the two sensors in the same direction will generate offset data in opposite directions. Differential positioning is set up in the curve area, and spline curves are drawn using longitude and latitude to obtain the subtle change data of the curve radius. A low-power microwave radar sensor is installed at a high position for irradiation to form a 3D map, analyze the flatness of the area, and obtain the change data.

[0021] The data acquisition module in the line gradient unit mainly includes an inclination sensor, which is used to monitor the small load eccentricity, rail web stress, stress and displacement at the connection between the rail head and the rail web.

[0022] The data acquisition module in the culvert unit includes the monitoring of the depth of accumulated water (ice), the culvert guardrail, and the status of the height limit railing. The depth of accumulated water is measured by an ultrasonic ranging sensor to obtain the change data of the depth in the pit. An inclination sensor is set to detect the attitude change of the guardrail. The status of the height limit railing is detected by arranging optical fibers along the railing and using an optical fiber sensor to detect the integrity.

[0023] The data acquisition module in the tunnel unit includes an image sensor, which acquires the image information in the tunnel and compares it with the normal state to determine whether there are any problems.

[0024] The data acquisition module in the bridge unit includes the monitoring of four parts: bridge piers, bridge decks, the track on the bridge, and guardrails. Differential positioning is used to monitor the static position changes, and attitude sensors are used to monitor the dynamic changes to obtain the change data of the bridge piers and bridge decks. The straightness of the track on the bridge is measured by Beidou differential positioning, which is set up at the head and tail and in the middle of the bridge to compare the straightness after connecting the longitude and latitude. The expansion amount is measured by an infrared ranging sensor in a non-contact manner. The vibration acceleration is monitored by a vibration sensor to obtain the data. The position changes of the guardrails and the upper protective parts of the bridge decks are accurately positioned by Beidou differential positioning. Passive RFID tags can be attached to small components on the bridge, and a scanner antenna is used to monitor whether the components in the area have fallen or are missing.

[0025] The data acquisition module in the noise barrier unit mainly monitors the data information of the position and integrity. The position is measured by an inclination sensor to detect the attitude change of each noise barrier. The integrity is obtained by comparing and analyzing the vibration test data of the vibration sensor with the vibration response of the undamaged structure to form the structure damage identification data.

[0026] The data acquisition module in the canopy unit mainly consists of an amplitude sensor and a ranging sensor, which obtain the vibration amplitude information of the canopy and the position status of the canopy.

[0027] The data acquisition module in the turnout unit mainly includes an infrared ranging sensor. A reference stake is set up on the subgrade to install the infrared ranging sensor, and ranging targets are installed on the switch rail and the split rail. Measurements are taken statically. The gauge change is obtained by summing the data on both sides, and the rail expansion and contraction amount is measured through target conversion. Through vibration sensors, data information such as the vibration frequency and amplitude of the traction point is monitored dynamically.

[0028] As Figure 3 shown in the wireless transmission scheme, the monitoring data obtained by each unit of the section line is transmitted to the canopy unit in the order from far to near the station by wireless transmission by the section line monitoring unit. The canopy unit uploads all the data to the data monitoring center by wired transmission, and stores and displays various monitored data statuses on the display terminal. Among them, each monitoring unit is further divided into n sub-units (n≥1) and a unit terminal according to the length of the target to be monitored. In a single monitoring unit, in order to reduce the power consumption of wireless transmission, the wireless data of the sub-units is serially sent to the unit terminal. And the wireless transmission between different units adopts a serial scheme, as Figure 3 shown. Among them, the wireless transmission order of the 9 units including the optical band unit, the curve radius unit, the line gradient unit, the culvert unit, the tunnel unit, the bridge unit, the sound barrier unit, the turnout unit, and the canopy monitoring unit in the system is configured according to the specific situation of the monitored line. Generally speaking, it is set from far to near the station along the monitoring line from the section.

[0029] The power supply system selects one of the current induction power supply, the wind power system, and the solar power system as the power supply for the status monitoring unit according to the power consumption of each unit status collector. Different sampling frequencies are set according to the needs of the railway operation cycle to achieve energy conservation without reducing the response speed. The RS485 digital or 4-20mA analog transmission is used between the collector and the sensor to unify the sensor interface. The collector automatically wakes up the MCU and turns on the sensor power supply when measurement is required. After the measurement is completed, it enters the sleep state and turns off the peripheral power supply.

[0030] Although the specific implementation manners of the present invention have been described above, those skilled in the art should understand that these are only examples, and various changes or modifications can be made to this implementation manner without departing from the principle and essence of the present invention. The protection scope of the present invention is only defined by the appended claims.

Claims

1. A comprehensive monitoring system for railway line status, characterized in that: It includes a railway line status monitoring unit, which transmits information to the canopy unit through a wireless transmission network, and the canopy unit is the end point of wireless receipt reception; The canopy unit transmits the acquired transmission data to the detection data center via the local area network, and the state monitoring unit is powered by the power supply; The state monitoring unit includes a line section monitoring module and a station monitoring module. The section monitoring module includes a light band unit, a curve radius unit, a line slope unit, a culvert unit, a tunnel unit, a bridge unit, and a sound barrier unit; the station monitoring module includes a turnout unit and a canopy unit; The data acquisition module in the light strip unit mainly includes rail displacement monitoring and image sensors, which are used to obtain the overall width anomaly of the light strip, the eccentricity of the light strip, and the local anomaly of the light strip; The data acquisition module in the curve radius unit includes a posture sensor. By setting up posture sensors at both ends of the measuring rail, the posture angles in static state are compared. When the straightness changes, the angles of the two sensors in the same direction will produce offset data in the opposite direction. Differential positioning is set up in the curve area, and spline curves are drawn using longitude and latitude to obtain the subtle change data of the curve radius. A low-power microwave radar sensor is set up at a high position to irradiate, form a three-dimensional map, analyze the flatness of the area, and obtain change data. The data acquisition module in the line slope unit mainly includes an inclination sensor, which is used to monitor the small load eccentricity, rail waist stress, and stress and displacement at the connection between the rail head and rail waist.

2. The integrated monitoring system for railway line status according to claim 1, characterized in that: Each monitoring unit contains three modules: data acquisition, data processing and data transmission. Data acquisition is a specific module, and sensors are set to obtain data according to the unit's data acquisition characteristics.

3. A comprehensive railway line status monitoring system according to claim 2, characterized in that: The power supply of the state monitoring unit adopts one of a current induction power supply, a wind power system, and a solar power system.

4. The integrated monitoring system for railway line status according to claim 3, wherein: The sensor of each monitoring unit is connected to the collector using RS485 digital or 4-20mA analog transmission to unify the sensor interface. The collector automatically wakes up the MCU and turns on the sensor power when measurement is required. After the measurement is completed, it enters the sleep state and turns off the peripheral power.

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